https://mattes.dev/blog Notes on frontend architecture, local-first software and small builds without dependencies. en Fri, 18 Sep 2026 12:00:00 +0000 https://mattes.dev/blog/wordpace-localization https://mattes.dev/blog/wordpace-localization Fri, 18 Sep 2026 12:00:00 +0000 From eleven interface languages to 28 and 27 App Store listings: a locale table derived from the speech recognizer, translation against written briefs, listings and keywords written per market, 189 rendered screenshots, and a fastlane upload that shows its diff before it pushes. https://mattes.dev/blog/coffetime https://mattes.dev/blog/coffetime Sun, 23 Aug 2026 12:00:00 +0000 A PWA for the shared coffee tab in an office kitchen: passkey login without usernames, account names sealed with an RSA key the server never holds, prices frozen per booking, and an offline queue that cannot double-count. https://mattes.dev/blog/epaper-components https://mattes.dev/blog/epaper-components Wed, 12 Aug 2026 12:00:00 +0000 A web component library for electrophoretic displays: just over eighty custom elements without a framework, form-associated controls, and a design that follows from the refresh and contrast behaviour of e-paper panels. https://mattes.dev/blog/wordpace https://mattes.dev/blog/wordpace Sun, 09 Aug 2026 12:00:00 +0000 A speaking-pace meter for iPhone and Mac: a words-per-minute limit, a full-screen warning when it is exceeded, measurement over speaking time instead of wall-clock time, and audio that is discarded after the calculation. https://mattes.dev/blog/reterminal-departure-board https://mattes.dev/blog/reterminal-departure-board Wed, 05 Aug 2026 12:00:00 +0000 A Seeed reTerminal E1001 as a live VVS departure board with ESPHome: the API is queried and parsed on the device, and no intermediate server is involved. https://mattes.dev/blog/clessira https://mattes.dev/blog/clessira Wed, 08 Jul 2026 12:00:00 +0000 A local-first time tracker for macOS, iPhone and iPad: idle detection with confirmation prompts, pivot-table reporting, Jira import, Git branch awareness, and a local JSON file as the data store. https://mattes.dev/blog/local-first https://mattes.dev/blog/local-first Wed, 10 Jun 2026 12:00:00 +0000 Local-first software keeps the authoritative copy of the data on the user's device. What that storage model means in practice, and which design decisions it implies for a time tracker.